A looksmatch is someone who is equal to another person on the decile scale. In other words, someone who is in the same percentile of physical attractiveness within their gender demographic as the other person is in their gender demographic.
The matching hypothesis suggested that people naturally prefer their looksmatch. However, Walster's computer dating study suggested otherwise, namely that only the looks of the potential partner predicts romantic interest, not how similar they are in looks. Data from online dating suggests that men and women alike aim a bit higher than their own desirability, with few aiming excessively high. This may imply that without enforced monogamy, both men and women will lack pressure to settle for the "art of the possible," thus more people remain single.